So after the first few games of the season with buffed resil and 522 ilvl i can state that the class ist actually dead in WoW PvP and there are two reasons for it:
1) the class is complete dogshit. only thing you are good for in any comp is stupid dmg in gargoyle just like it has been since it's inception. Since you have no escape you are pretty much overextended 24/7 because i dont know what deathgrip is. once you sit in roots you never get out. and guess what when your seven trinkets are down you flop in a CS even with all cds rdy.
2) the amount of castercleave in higher ratings seems equivalent to the amount of caster cleaves that have existed since s5 except when a certain hunter/melee comp was op. EVERY game against Lsd ;Mage/destro ;Affli/ele ; shadow/mage is prettymuch a uphillbattle from sec 1 in arena. the only time you win is if you get rng lucky but if they dont fuck up hard you lose every single time. The amount of instant cc together with them just Pveing you down is just ridiculous. the funny thing is the same classes that complain about DK as soon as they lose 1 of 20 games against a Dk team because they got SRd are the ones who delete you off their screen even outside of their cooldowns. (Destro: "hello mr dk could you hold some of these 120k+ chaosbolts for me ....and by the way mr.dk you dmg is to high better eat one of my 10 fears or let me port or let me gate even when my healer sits full cc chains)
Even when there will again be more dks getting glad or r1 last season on this class than enhancement shamans nobody can say that is is actually fun to play
Hope you make a dk guide